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<div class="chapter">
<div class="titlepage"><div><div><h1 class="title">
<a name="function_invocation_and_creation"></a>Chapter 4. Function Invocation and Creation</h1></div></div></div>
<div class="toc">
<p><b>Table of Contents</b></p>
<dl class="toc">
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp">boost/python/args.hpp</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.introduction">Introduction</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.class_arg">Class
        <code class="computeroutput"><span class="identifier">arg</span></code></a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.class_arg_constructor">Class
        <code class="computeroutput"><span class="identifier">arg</span></code> constructor</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.class_arg_operator">Class
        <code class="computeroutput"><span class="identifier">arg</span></code> operator=</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.keyword_expression_operator">Keyword-expression
        operator,</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.example">Example</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_call_hpp.html">boost/python/call.hpp</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_call_hpp.html#function_invocation_and_creation.boost_python_call_hpp.introduction">Introduction</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_call_hpp.html#function_invocation_and_creation.boost_python_call_hpp.function_call">Function
        <code class="computeroutput"><span class="identifier">call</span></code></a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_call_hpp.html#function_invocation_and_creation.boost_python_call_hpp.example">Example</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_call_method_hpp.html">boost/python/call_method.hpp</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_call_method_hpp.html#function_invocation_and_creation.boost_python_call_method_hpp.introduction">Introduction</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_call_method_hpp.html#function_invocation_and_creation.boost_python_call_method_hpp.function_call_method">Function
        <code class="computeroutput"><span class="identifier">call_method</span></code></a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_call_method_hpp.html#function_invocation_and_creation.boost_python_call_method_hpp.example">Example</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_data_members_hpp.html">boost/python/data_members.hpp</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_data_members_hpp.html#function_invocation_and_creation.boost_python_data_members_hpp.introduction">Introduction</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_data_members_hpp.html#function_invocation_and_creation.boost_python_data_members_hpp.functions">Functions</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_data_members_hpp.html#function_invocation_and_creation.boost_python_data_members_hpp.example">Example</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_make_function_hpp.html">boost/python/make_function.hpp</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_make_function_hpp.html#function_invocation_and_creation.boost_python_make_function_hpp.introduction">Introduction</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_make_function_hpp.html#function_invocation_and_creation.boost_python_make_function_hpp.functions">Functions</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_make_function_hpp.html#function_invocation_and_creation.boost_python_make_function_hpp.example">Example</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_overloads_hpp.html">boost/python/overloads.hpp</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_overloads_hpp.html#function_invocation_and_creation.boost_python_overloads_hpp.introduction">Introduction</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_overloads_hpp.html#function_invocation_and_creation.boost_python_overloads_hpp.overloaddispatcher_concept">OverloadDispatcher
        Concept</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_overloads_hpp.html#function_invocation_and_creation.boost_python_overloads_hpp.macros">Macros</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_overloads_hpp.html#function_invocation_and_creation.boost_python_overloads_hpp.example">Example</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_ptr_hpp.html">boost/python/ptr.hpp</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_ptr_hpp.html#function_invocation_and_creation.boost_python_ptr_hpp.introduction">Introduction</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_ptr_hpp.html#function_invocation_and_creation.boost_python_ptr_hpp.functions">Functions</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_ptr_hpp.html#function_invocation_and_creation.boost_python_ptr_hpp.class_template_pointer_wrapper">Class
        template <code class="computeroutput"><span class="identifier">pointer_wrapper</span></code></a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_ptr_hpp.html#function_invocation_and_creation.boost_python_ptr_hpp.class_template_pointer_wrapper_t">Class
        template <code class="computeroutput"><span class="identifier">pointer_wrapper</span></code>
        types</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_ptr_hpp.html#function_invocation_and_creation.boost_python_ptr_hpp.class_template_pointer_wrapper_c">Class
        template <code class="computeroutput"><span class="identifier">pointer_wrapper</span></code>
        constructors and destructor</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_ptr_hpp.html#function_invocation_and_creation.boost_python_ptr_hpp.class_template_pointer_wrapper_o">Class
        template <code class="computeroutput"><span class="identifier">pointer_wrapper</span></code>
        observer functions</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_ptr_hpp.html#function_invocation_and_creation.boost_python_ptr_hpp.metafunctions">Metafunctions</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_ptr_hpp.html#function_invocation_and_creation.boost_python_ptr_hpp.example">Example</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_raw_function_hpp.html">boost/python/raw_function.hpp</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_raw_function_hpp.html#function_invocation_and_creation.boost_python_raw_function_hpp.introduction">Introduction</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_raw_function_hpp.html#function_invocation_and_creation.boost_python_raw_function_hpp.function_raw_function">Function
        <code class="computeroutput"><span class="identifier">raw_function</span></code></a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/boost_python_raw_function_hpp.html#function_invocation_and_creation.boost_python_raw_function_hpp.example">Example</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="function_invocation_and_creation/function_documentation.html">Function
      documentation</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation/function_documentation.html#function_invocation_and_creation.function_documentation.boost_python_function_doc_signat">boost/python/function_doc_signature.hpp</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/function_documentation.html#function_invocation_and_creation.function_documentation.boost_python_pytype_function_hpp">boost/python/pytype_function.hpp</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_callpolicies.html">Models
      of CallPolicies</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_callpolicies.html#function_invocation_and_creation.models_of_callpolicies.boost_python_default_call_polici">boost/python/default_call_policies.hpp</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_callpolicies.html#function_invocation_and_creation.models_of_callpolicies.boost_python_return_arg_hpp">boost/python/return_arg.hpp</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_callpolicies.html#function_invocation_and_creation.models_of_callpolicies.boost_python_return_internal_ref">boost/python/return_internal_reference.hpp</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_callpolicies.html#function_invocation_and_creation.models_of_callpolicies.boost_python_return_value_policy">boost/python/return_value_policy.hpp</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_callpolicies.html#function_invocation_and_creation.models_of_callpolicies.boost_python_with_custodian_and_">boost/python/with_custodian_and_ward.hpp</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_resultconverter.html">Models
      of ResultConverter</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_resultconverter.html#function_invocation_and_creation.models_of_resultconverter.boost_python_to_python_indirect_">boost/python/to_python_indirect.hpp</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_resultconverter.html#function_invocation_and_creation.models_of_resultconverter.boost_python_to_python_value_hpp">boost/python/to_python_value.hpp</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_resultconvertergenerat.html">Models
      of ResultConverterGenerator</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_resultconvertergenerat.html#function_invocation_and_creation.models_of_resultconvertergenerat.boost_python_copy_const_referenc">boost/python/copy_const_reference.hpp</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_resultconvertergenerat.html#function_invocation_and_creation.models_of_resultconvertergenerat.boost_python_copy_non_const_refe">boost/python/copy_non_const_reference.hpp</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_resultconvertergenerat.html#function_invocation_and_creation.models_of_resultconvertergenerat.boost_python_manage_new_object_h">boost/python/manage_new_object.hpp</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_resultconvertergenerat.html#function_invocation_and_creation.models_of_resultconvertergenerat.boost_python_reference_existing_">boost/python/reference_existing_object.hpp</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_resultconvertergenerat.html#function_invocation_and_creation.models_of_resultconvertergenerat.boost_python_return_by_value_hpp">boost/python/return_by_value.hpp</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation/models_of_resultconvertergenerat.html#function_invocation_and_creation.models_of_resultconvertergenerat.boost_python_return_opaque_point">boost/python/return_opaque_pointer.hpp</a></span></dt>
</dl></dd>
</dl>
</div>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="function_invocation_and_creation.boost_python_args_hpp"></a><a class="link" href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp" title="boost/python/args.hpp">boost/python/args.hpp</a>
</h2></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.introduction">Introduction</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.class_arg">Class
        <code class="computeroutput"><span class="identifier">arg</span></code></a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.class_arg_constructor">Class
        <code class="computeroutput"><span class="identifier">arg</span></code> constructor</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.class_arg_operator">Class
        <code class="computeroutput"><span class="identifier">arg</span></code> operator=</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.keyword_expression_operator">Keyword-expression
        operator,</a></span></dt>
<dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.example">Example</a></span></dt>
</dl></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="function_invocation_and_creation.boost_python_args_hpp.introduction"></a><a class="link" href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.introduction" title="Introduction">Introduction</a>
</h3></div></div></div>
<div class="toc"><dl class="toc"><dt><span class="section"><a href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.introduction.keyword_expressions">keyword-expressions</a></span></dt></dl></div>
<p>
          Supplies a family of overloaded functions for specifying argument keywords
          for wrapped C++ functions.
        </p>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="function_invocation_and_creation.boost_python_args_hpp.introduction.keyword_expressions"></a><a class="link" href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.introduction.keyword_expressions" title="keyword-expressions">keyword-expressions</a>
</h4></div></div></div>
<p>
            A keyword-expression results in an object which holds a sequence of
            <a class="link" href="glossary.html#ntbs">ntbs</a>es, and whose type encodes the number
            of keywords specified. The keyword-expression may contain default values
            for some or all of the keywords it holds
          </p>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="function_invocation_and_creation.boost_python_args_hpp.class_arg"></a><a class="link" href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.class_arg" title="Class arg">Class
        <code class="computeroutput"><span class="identifier">arg</span></code></a>
</h3></div></div></div>
<p>
          The objects of class arg are keyword-expressions holding one keyword (
          size one )
        </p>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">python</span>
<span class="special">{</span>
        <span class="keyword">struct</span> <span class="identifier">arg</span>
        <span class="special">{</span>
          <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
                  <span class="identifier">arg</span> <span class="special">&amp;</span><span class="keyword">operator</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="identifier">value</span><span class="special">);</span>
          <span class="keyword">explicit</span> <span class="identifier">arg</span> <span class="special">(</span><span class="keyword">char</span> <span class="keyword">const</span> <span class="special">*</span><span class="identifier">name</span><span class="special">){</span><span class="identifier">elements</span><span class="special">[</span><span class="number">0</span><span class="special">].</span><span class="identifier">name</span> <span class="special">=</span> <span class="identifier">name</span><span class="special">;}</span>
        <span class="special">};</span>

<span class="special">}}</span>
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="function_invocation_and_creation.boost_python_args_hpp.class_arg_constructor"></a><a class="link" href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.class_arg_constructor" title="Class arg constructor">Class
        <code class="computeroutput"><span class="identifier">arg</span></code> constructor</a>
</h3></div></div></div>
<pre class="programlisting"><span class="identifier">arg</span><span class="special">(</span><span class="keyword">char</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">name</span><span class="special">);</span></pre>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Requires</span></dt>
<dd><p>
                The argument must be a <a class="link" href="glossary.html#ntbs">ntbs</a>.
              </p></dd>
<dt><span class="term">Effects</span></dt>
<dd><p>
                Constructs an arg object holding a keyword with name name.
              </p></dd>
</dl>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="function_invocation_and_creation.boost_python_args_hpp.class_arg_operator"></a><a class="link" href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.class_arg_operator" title="Class arg operator=">Class
        <code class="computeroutput"><span class="identifier">arg</span></code> operator=</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="identifier">arg</span> <span class="special">&amp;</span><span class="keyword">operator</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="identifier">value</span><span class="special">);</span></pre>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Requires</span></dt>
<dd><p>
                The argument must convertible to python.
              </p></dd>
<dt><span class="term">Effects</span></dt>
<dd><p>
                Assigns default value for the keyword.
              </p></dd>
<dt><span class="term">Returns</span></dt>
<dd><p>
                Reference to <code class="computeroutput"><span class="keyword">this</span></code>.
              </p></dd>
</dl>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="function_invocation_and_creation.boost_python_args_hpp.keyword_expression_operator"></a><a class="link" href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.keyword_expression_operator" title="Keyword-expression operator,">Keyword-expression
        operator,</a>
</h3></div></div></div>
<pre class="programlisting"><span class="identifier">keyword</span><span class="special">-</span><span class="identifier">expression</span> <span class="keyword">operator</span> <span class="special">,</span> <span class="special">(</span><span class="identifier">keyword</span><span class="special">-</span><span class="identifier">expression</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">arg</span> <span class="special">&amp;</span><span class="identifier">kw</span><span class="special">)</span> <span class="keyword">const</span>
<span class="identifier">keyword</span><span class="special">-</span><span class="identifier">expression</span> <span class="keyword">operator</span> <span class="special">,</span> <span class="special">(</span><span class="identifier">keyword</span><span class="special">-</span><span class="identifier">expression</span><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span><span class="identifier">name</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Requires</span></dt>
<dd><p>
                The argument name must be a <a class="link" href="glossary.html#ntbs">ntbs</a>.
              </p></dd>
<dt><span class="term">Effects</span></dt>
<dd><p>
                Extends the keyword-expression argument with one more keyword.
              </p></dd>
<dt><span class="term">Returns</span></dt>
<dd><p>
                The extended keyword-expression.
              </p></dd>
</dl>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="function_invocation_and_creation.boost_python_args_hpp.example"></a><a class="link" href="function_invocation_and_creation.html#function_invocation_and_creation.boost_python_args_hpp.example" title="Example">Example</a>
</h3></div></div></div>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">python</span><span class="special">/</span><span class="identifier">def</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">python</span><span class="special">;</span>

<span class="keyword">int</span> <span class="identifier">f</span><span class="special">(</span><span class="keyword">double</span> <span class="identifier">x</span><span class="special">,</span> <span class="keyword">double</span> <span class="identifier">y</span><span class="special">,</span> <span class="keyword">double</span> <span class="identifier">z</span><span class="special">=</span><span class="number">0.0</span><span class="special">,</span> <span class="keyword">double</span> <span class="identifier">w</span><span class="special">=</span><span class="number">1.0</span><span class="special">);</span>

<span class="identifier">BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">xxx</span><span class="special">)</span>
<span class="special">{</span>
  <span class="identifier">def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span> <span class="identifier">f</span><span class="special">,</span> <span class="special">(</span><span class="identifier">arg</span><span class="special">(</span><span class="string">"x"</span><span class="special">),</span> <span class="string">"y"</span><span class="special">,</span> <span class="identifier">arg</span><span class="special">(</span><span class="string">"z"</span><span class="special">)=</span><span class="number">0.0</span><span class="special">,</span> <span class="identifier">arg</span><span class="special">(</span><span class="string">"w"</span><span class="special">)=</span><span class="number">1.0</span><span class="special">));</span>
<span class="special">}</span>
</pre>
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